But, Beside the prevalence from Salt-petre, as Master-ingredient in the mixture; Sulphur may hold a greater use in the composition and further activity in the exclusion, then is by most conceived. For Sulphur vive makes better Powder then common Sulphur, which nevertheless is of a quick accension. For Small-coal, Salt-petre, and _Camphire_ made into Powder will be of little force, wherein notwithstanding there wants not the accending ingredient. And _Camphire_ though it flame well, yet will not flush so lively, or defecate Salt-petre, if you inject it thereon, like Sulphur; as in the preparation of _Sal prunellæ_. And lastly, though many ways may be found to light this Powder, yet is there none I know to make a strong and vigorous Powder of Salt-petre, without the admixtion of Sulphur. _Arsenic_ red and yellow, that is _Orpement_ and _Sandarach_ may perhaps do something, as being inflamable and containing Sulphur in them; but containing also a salt, and mercurial mixtion, they will be of little effect; and white or crystalline _Arsenic_ of less, for that being artificial, and sublimed with salt, will not endure flammation. This Antipathy or contention between Salt-petre and Sulphur upon an actual fire, in their compleat and distinct bodies, is also manifested in their preparations, and bodies which invisibly contain them. Thus in the preparation of _Crocus Metallorum_, the matter kindleth and flusheth like Gunpowder, wherein notwithstanding, there is nothing but _Antimony_ and Salt-petre. But this may proceed from the Sulphur of _Antimony_, not enduring the society of Salt-petre; for after three or four accensions, through a fresh addition of Petre, the Powder will flush no more, for the sulphur of the _Antimony_ is quite exhaled. Thus Iron in _Aqua fortis_ will fall into ebullition, with noise and emication, as also a crass and fumid exhalation, which are caused from this combat of the sulphur of Iron with the acid and nitrous spirits of _Aqua fortis_. So is it also in _Aurum fulminans_, or Powder of Gold dissolved in _Aqua Regis_, and precipitated with oyl of _Tartar_, which will kindle without an actual fire, and afford a report like Gun-powder; that is not as _Crollius_ affirmeth from any Antipathy between _Sal Armoniac_ [SN: De consensu Chymicorum, etc.]and _Tartar_, but rather between the nitrous spirits of _Aqua Regis_, commixed _per minima_ with the sulphur of Gold, as _Sennertus_ hath observed. [Sidenote: _How Coral of a Plant becomes a Stone._]